Gudgeon Pin

High Quality Content by WIKIPEDIA articles! In internal combustion engines, the gudgeon pin (UK, wrist pin US) is that which connects the piston to the connecting rod and provides a bearing for the connecting rod to pivot upon as the piston moves. In very early engine designs (including those driven by steam and also many very large stationary or marine engines), the gudgeon pin is located in a sliding crosshead that connects to the piston via a rod.